Results 211 to 220 of about 15,932 (235)

An Internal Expansive Stress Model of Concrete under Sulfate Attack

Acta Mechanica Solida Sinica, 2016
Abstract Concrete experiences expansive deformation during sulfate attack due to internal expansive stress. Sulfate ions enter concrete pores, react with the pore solution, and produce ettringite. The production of ettringite explains the internal expansive stress that reduces the durability of concrete. In this study, the model of internal expansive
Hui Song, Jiankang Chen, Jinyang Jiang
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Iron sulfide-related internal sulfate attack: microstructure and mechanism

Magazine of Concrete Research, 2018
The internal sulfate attack of concrete, which is caused by iron sulfide, was investigated, and the attack mechanism is also proposed in this study. The specimens were collected from a bridge pier suffering from pop-outs and showing visible rust staining.
Xueqin Han, Chaoming Pang, Renhui Gao, Shengping Wu, Wei Sun   +4 more
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The Development of Accelerated Test Method for Internal Sulfate Attack by Delayed Ettringite Formation

Materials Science Forum, 2020
Delayed Ettringite Formation (DEF) is an internal sulfate attack caused by heat-induced decomposition and/or prevention of normal ettringite formed during the initial hydration of cement at elevated temperature (above about 70°C) and its re-crystallization in the hardened matrix.
Van Huong Nguyen, Nordine Leklou, Pierre Mounanga   +2 more
openaire   +1 more source

A microstructural hydration model for cemented paste backfill considering internal sulfate attacks

Construction and Building Materials, 2019
Abstract Cemented paste backfill (CPB) is a type of cementitious material produced with tailings, cement, and water. Typically, CPB has a high proportion of tailings (75–80 wt%), which may contain a large amount of sulfide minerals that can cause serious attacks in the CPB system.
Lang Liu, Chao Zhu, Chongchong Qi, Bo Zhang, Ki-Il Song   +4 more
openaire   +1 more source

Internal Sulfate Attack: Distress Mechanism at Ambient and Elevated Temperatures?

"SP-177: Ettringite, the Sometimes Host of Destruction", 1999
Recent debate on delayed ettringinte formation (DEF) as a form of internal sulfate attack -- a distress mechanism for ambient- and steam-cured concrete -- has motivated this paper, which examines relevant data from the literature and from the author's laboratory.
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Behavior of High Performance Concrete Exposed to Internal Sulfate Attack (Gypsum-Contaminated Aggregate)

Earth & Space 2006, 2006
Contamination of aggregates with sulfate salts (especially gypsum) is a major problem in Middle East concrete construction. Fine aggregate has more detrimental effect due to its large surface area (fineness). An experimental work had carried out to investigate the behavior of high performance concrete exposed to internal sulfate attack in comparison ...
Tariq S. Al-Attar, Alaa M. Al-Khateeb, Abid H. Bachai   +2 more
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Consecutive pozzolanic layerings to depress internal-sulfate-attack corrosion of OPC by phosphogypsum-based cold bonded aggregates

Corrosion Science
Ziyan Wang, Gaoshang Ouyang
exaly   +2 more sources

Evaluation of the Potential for Internal Sulfate Attack Through Adaptation of ASTM C 342 and the Duggan Test

Cement, Concrete, and Aggregates, 1999
Abstract The potential for distress resulting from internal sulfate attack in mortars was evaluated using a test method adapted from ASTM Test Method (C 342) and the Duggan test. While these test procedures were originally developed to evaluate the potential for cement-aggregate combinations to undergo deleterious alkali-aggregate ...
DS Lane, HC Ozyildirim
openaire   +1 more source

Conclusions of the International RILEM TC 186-ISA Workshop on Internal Sulfate Attack and Delayed Ettringite Formation (4–6 September 2002, Villars, Switzerland)

Materials and Structures, 2005
A RILEM technical committee on Internal Sulfate Attack (TC 186-ISA) was established in 1996. In the ensuing years considerable research was carried out, which helped to clarify the scientific knowledge surrounding this form of degradation. A Seminar was organised in September 2002 to bring together the leading researchers in the field to debate the ...
Scrivener, K. L., Skalny, J. P.
openaire   +2 more sources

International RILEM Workshop on Internal Sulfate attack and Delayed Ettringite Formation

Materials and Structures, 2004
K. Scrivener, J. Skalny
openaire   +1 more source